Do you have any twin friends or relatives how do you recognise them

My brother (my twin, incidently) has friends that are identical mirror images. Meaning one is left handed, one is right handed, one is thicker, one is thinner. Eventually I could tell who was who by which side of the stage they played on and now I can tell their personalities apart.

I have aunts that are twins, they are 5 years older than myself. When we were younger the only way I could tell them apart was to wait for someone else to call one by her name and then I would remember what that one was wearing and could keep them straight. As we got older the twins changed and now I have not trouble telling them apart, one weighs more and the other is a little taller.